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Version 8.0.3 breaks the webidl cache #5024
Description
I know that Node v20 isn't technically supported, but the following script works on 8.0.2 under Node 20.20.2, but it does not work with 8.0.3:
'use strict'
const undici = require('undici')
main()
.then(() => {})
.catch(console.error)
async function main() {
const { statusCode } = await undici.request(
'http://httpbin.org/',
{
path: '/anything',
method: 'POST',
headers: { 'content-type': 'application/json' },
body: Buffer.from('{"hello":"world"}')
}
)
console.log('status code: ', statusCode)
}❯ node index.js
/private/tmp/13/repro/node_modules/undici/lib/web/cache/cachestorage.js:20
webidl.util.markAsUncloneable(this)
^
TypeError: webidl.util.markAsUncloneable is not a function
at new CacheStorage (/private/tmp/13/repro/node_modules/undici/lib/web/cache/cachestorage.js:20:17)
at Object.<anonymous> (/private/tmp/13/repro/node_modules/undici/index.js:179:25)
at Module._compile (node:internal/modules/cjs/loader:1521:14)
at Module._extensions..js (node:internal/modules/cjs/loader:1623:10)
at Module.load (node:internal/modules/cjs/loader:1266:32)
at Module._load (node:internal/modules/cjs/loader:1091:12)
at Module.require (node:internal/modules/cjs/loader:1289:19)
at require (node:internal/modules/helpers:182:18)
at Object.<anonymous> (/private/tmp/13/repro/index.js:3:16)
at Module._compile (node:internal/modules/cjs/loader:1521:14)
Node.js v20.20.2
Activity
mcollina commentedon Apr 13, 2026
As you said, it's not supported ;).
Does anything bad happen on v22?
jsumners-nr commentedon Apr 13, 2026
No. But the fact it works on 8.0.2 and not on 8.0.3 seems like something to investigate regardless of runtime version.
KhafraDev commentedon Apr 14, 2026
undici v8 dropped support for node v20 in 393094a
undici/package.json
Line 136 in 6824eed
It doesn't seem actionable to me. Feel free to reopen if you feel otherwise.
jblazquez-cdi commentedon Apr 15, 2026
It would be nice to signal change of minimum node versions as a breaking change in the release text. I read the release text, I saw no breaking change (at least not one that it should care about), and updated, just to have this same error. Fortunately 7.25 works enough for me.
timtucker-dte commentedon Apr 16, 2026
If you want to see clearer errors when there's a breaking change, add:
engine-strict=trueTo your .npmrc file
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